package com.tjtt.common.utils;       
      
import java.awt.AlphaComposite;       
import java.awt.Color;       
import java.awt.Font;       
import java.awt.Graphics2D;       
import java.awt.Image;       
import java.awt.geom.AffineTransform;       
import java.awt.image.AffineTransformOp;       
import java.awt.image.BufferedImage;       
import java.io.File;       
import java.io.IOException;       
      
import javax.imageio.ImageIO;       
      
      
public final class ImageUtils {       
    /**     
     * 图片水印     
     *      
     * @param pressImg     
     *            水印图片     
     * @param targetImg     
     *            目标图片     
     * @param x     
     *            修正值 默认在中间     
     * @param y     
     *            修正值 默认在中间     
     * @param alpha     
     *            透明度     
     */      
    public final static void pressImage(String pressImg, String targetImg, int x, int y, float alpha) {       
        try {       
            File img = new File(targetImg);       
            Image src = ImageIO.read(img);       
            int wideth = src.getWidth(null);       
            int height = src.getHeight(null);       
            BufferedImage image = new BufferedImage(wideth, height, BufferedImage.TYPE_INT_RGB);       
            Graphics2D g = image.createGraphics();       
            g.drawImage(src, 0, 0, wideth, height, null);       
            // 水印文件       
            Image src_biao = ImageIO.read(new File(pressImg));       
            int wideth_biao = src_biao.getWidth(null);       
            int height_biao = src_biao.getHeight(null);       
            g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));       
            g.drawImage(src_biao, (wideth - wideth_biao) / 2, (height - height_biao) / 2, wideth_biao, height_biao, null);       
            // 水印文件结束       
            g.dispose();       
            ImageIO.write((BufferedImage) image, "jpg", img);       
        } catch (Exception e) {       
            e.printStackTrace();       
        }       
    }       
      
    /**     
     * 文字水印     
     *      
     * @param pressText     
     *            水印文字     
     * @param targetImg     
     *            目标图片     
     * @param fontName     
     *            字体名称     
     * @param fontStyle     
     *            字体样式     
     * @param color     
     *            字体颜色     
     * @param fontSize     
     *            字体大小     
     * @param x     
     *            修正值     
     * @param y     
     *            修正值     
     * @param alpha     
     *            透明度     
     */      
    public static void pressText(String pressText, String targetImg, String fontName, int fontStyle, Color color, int fontSize, int x, int y, float alpha) {       
        try {       
            File img = new File(targetImg);       
            Image src = ImageIO.read(img);       
            int width = src.getWidth(null);       
            int height = src.getHeight(null);       
            BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);       
            Graphics2D g = image.createGraphics();       
            g.drawImage(src, 0, 0, width, height, null);       
            g.setColor(color);       
            g.setFont(new Font(fontName, fontStyle, fontSize));       
            //g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_ATOP, alpha));       
            g.drawString(pressText, (width - (getLength(pressText) * fontSize)) / 2 + x, (height - fontSize) / 2 + y);       
            g.dispose();       
            ImageIO.write((BufferedImage) image, "jpg", img);       
        } catch (Exception e) {       
            e.printStackTrace();       
        }       
    }       
      
    /**     
     * 缩放     
     *      
     * @param filePath     
     *            图片路径     
     * @param height     
     *            高度     
     * @param width     
     *            宽度     
     * @param bb     
     *            比例不对时是否需要补白     
     */      
    public static void resize(String filePath, int height, int width, boolean bb) {       
        try {       
            double ratio = 0; // 缩放比例       
            File f = new File(filePath);       
            BufferedImage bi = ImageIO.read(f);       
            Image itemp = bi.getScaledInstance(width, height, bi.SCALE_SMOOTH);       
            // 计算比例       
            if ((bi.getHeight() > height) || (bi.getWidth() > width)) {       
                if (bi.getHeight() > bi.getWidth()) {       
                    ratio = (new Integer(height)).doubleValue() / bi.getHeight();       
                } else {       
                    ratio = (new Integer(width)).doubleValue() / bi.getWidth();       
                }       
                AffineTransformOp op = new AffineTransformOp(AffineTransform.getScaleInstance(ratio, ratio), null);       
                itemp = op.filter(bi, null);       
            }       
            if (bb) {       
                BufferedImage image = new BufferedImage(width, height,       
                        BufferedImage.TYPE_INT_RGB);       
                Graphics2D g = image.createGraphics();       
                g.setColor(Color.white);       
                g.fillRect(0, 0, width, height);       
                if (width == itemp.getWidth(null))       
                    g.drawImage(itemp, 0, (height - itemp.getHeight(null)) / 2, itemp.getWidth(null), itemp.getHeight(null), Color.white, null);       
                else      
                    g.drawImage(itemp, (width - itemp.getWidth(null)) / 2, 0, itemp.getWidth(null), itemp.getHeight(null), Color.white, null);       
                g.dispose();       
                itemp = image;       
            }       
            ImageIO.write((BufferedImage) itemp, "jpg", f);       
        } catch (IOException e) {       
            e.printStackTrace();       
        }       
    }       
      
    public static void main(String[] args) throws IOException {       
        //pressImage("C:\\img\\20091111130358318152_20091116073648.gif", "C:\\img\\testjpg", 0, 0, 5f);       
        pressText("我是文字水印", "C:\\img\\20091111130358318152_20091116073648.gif", "黑体", 36, Color.black, 80,       
                200, 500, 3f);       
        //resize("G:\\imgtest\\testjpg", 500, 500, true);       
    }       
      
    public static int getLength(String text) {       
        int length = 0;       
        for (int i = 0; i < text.length(); i++) {       
            if (new String(text.charAt(i) + "").getBytes().length > 1) {       
                length += 2;       
            } else {       
                length += 1;       
            }       
        }       
        return length / 2;       
    }       
}      
   
